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16 Sep 2010

Owen builds a CNC laser cutter that can cut sheet metal. It’s rated at 250 Watt and costs around 15K $. Check constructions details on the link below. He writes: [via]

This is a CO2 laser system that cuts sheet metal. The laser and all optics are stationary. The beam is directed downwards on to the part that sits on a computer controlled platform which moves the piece in the x and y directions. Cutting is achieved by passing the beam through a focusing lens inside of a cutting head nozzle. Oxygen is fed into the side of the chamber below the focusing lens. This gas exits the nozzle along with the beam and the laser beam/oxygen combination serves to vaporize the steel.

DIY 250-watt laser cutter – [Link]

16 Sep 2010

This project shows how to build a laser projector using an Arduino, a heptagon pillbox, a cooler fan and a laser pointer. Check how it works  and construction details on the link below. The heptagon pillbox scan the projection surface and produced the words.  [via]

Because the mirrors are moving the reflected laser dot sweeps the screen from left to right, because it does it very quickly your eyes actually see an horizontal solid line, in this case you see 7 lines one on top of the other because the each mirror is at an angle.

DIY laser projector – [Link]

15 Sep 2010

This project shows how to build a temperature controlled soldering iron based on Atmega8 microcontroller. With this soldering iron you can set the desired temperature with two push buttons. Otherwise you can use three preset temperature buttons. Check schematic on the link below.

DIY Temperature Controlled Soldering Iron – [Link]

15 Sep 2010

Dave takes you step-by-step through designing a DC-DC converter using the venerable MC34063. And then he build it and checks the performance. [via]

Design a DC to DC Switchmode Converter – [Link]

15 Sep 2010

This project shows how to build a DIY laser CNC machine using parts from old printers and a CD-ROM. The laser diode using is rated at 1W. With this machine you are able to:

  • Cut paper
  • Engrave wood and cardboard
  • Engrave plastic
  • Engrave PCBs etc


DiY: How to build a homemade Router Laser CNC – [Link]

15 Sep 2010

Following up the announced of OpenPICUS wireless sensor platform project there is a review of the first Webserver application. It is a WIFI webserver on FlyPort module. Check the video for more details. With this server module you are able to control digital ouputs and read analog voltages on a web browser.

FlyPort Webserver – [Link]

15 Sep 2010

A relay sequencer is used in a radio transverter and is use to activate particular stages in order after short delay. This project describes how to build this sequencer. It has the following features.

  • Four negative sinked delayed output so higher voltages can be switched.
  • Adjustable delay (seconds to ms).
  • Input / output switching for TX or RX IF stages from radio.
  • Activation on PTT through +8VDC on the radio RF input or external +ve voltage control.50 ohm dummy load for radio RF signal.
  • Adjustable RF level for TX IF stages.
  • 12VDC operating voltage.

Relay Sequencer Board – [Link]

15 Sep 2010

This is a smoke/gas detection circuit. The sensor is the GH-312 sensor and it is used to detect : smoke、liquefied gas、butane and propane、Methane、alcohol、hydrogen、etc. Also has a 16F84A microcontroller and a 8X2 LCD.   The circuit is powered by a 9V battery but, since it’s used a 7805 regulator, a 12V battery can also be used. Attached is a picture of the circuit initializing. The LCD displays the circuit name “Gas Detector” and it’s version.   After initialization the circuit will enter a normal state where it detects no gas. The display shows “Sensing No Gas”.

PIC16F84A Gas Detector using GH-312 sensor – [Link]

14 Sep 2010

This project shows how to build a LED clock that simulates the hands of a traditional clock using rows of LEDs. It also has a ‘digital’ mode, where the LEDs are used to display the time in digital way.  Clock is based on PIC 16f877 microcontroller. Check schematics and construction details on the link below. [via]

‘Analog’ LED Clock – [Link]

14 Sep 2010

Flickr user Lucky Larry built this dynamo using a few rare earth magnets and a bit of wire. Check construction details on the link below.  [via]

DIY flashlight dynamo – [Link]





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